London Mayor Sadiq Khan today called for the public to remain “calm and vigilant” as police probed the Russell Square knife attack.

Mr Khan said his “heart goes out to the victims of the incident in Russell Square and their loved ones” after the death of the woman, who has not been identified but is believed to have been in her 60s.

Mr Khan said police were doing an “incredibly difficult job” and the safety of Londoners was his “number one priority”.

“I have spoken with the Commissioner, and the Assistant Commissioner, who have assured me that our police officers are working extremely hard to investigate exactly what has happened and to keep the rest of us safe.

“A man was arrested at the scene. Police have spoken to him and are seeking to establish the full facts including motives for this attack.

“I urge all Londoners to remain calm and vigilant. Please report anything suspicious to the police. We all have a vital role to play as eyes and ears for our police and security services and in helping to ensure London is protected.”